Durable Effects of Acupuncture for Knee Osteoarthritis: A Systematic Review and Meta-analysis.

The short version

Does acupuncture keep helping knee osteoarthritis after the needles stop? A 2024 systematic review and meta-analysis in Current Pain and Headache Reports pooled 10 randomized controlled trials with 3,221 participants to answer exactly that, and found benefits lasting roughly 3 to 6 months after the final session. The durability depended on the comparison. Against sham acupuncture, real acupuncture kept function measurably better for 4.5 months after treatment ended, and overall pain stayed lower through 4.5 months as well. Against usual care, both pain relief and functional improvement remained large enough to matter clinically for 5 months. One trial comparing dry needling with the anti-inflammatory drug diclofenac found relief persisting 6 months after treatment ended. Not every comparison favored acupuncture. When it was added on top of exercise-based physical therapy, it added nothing measurable for up to 11 months — exercise appears to occupy much of the same therapeutic ground. And two no-treatment-controlled trials disagreed, one showing 3 months of persistence and the other showing benefits only at end of treatment. Safety was consistently good across trials, with no significant excess of adverse events. For the estimated one in five adults over 40 living with knee osteoarthritis, the practical takeaway is that a 4-to-12-week course of acupuncture (typically 1–3 sessions weekly) can deliver relief that outlasts treatment by months — something NSAIDs and steroid injections generally cannot claim. It works best as its own treatment or alongside routine care, not stacked on structured exercise therapy, and results should be weighed knowing each individual comparison rested on relatively few trials.

Key findings

• Pooled analysis of 10 RCTs (3,221 participants) focused specifically on whether acupuncture benefits for knee osteoarthritis persist after treatment completion.
• Versus sham acupuncture, functional improvement and overall pain relief lasted about 4.5 months post-treatment; versus usual care, clinically important pain and function gains lasted 5 months; dry needling beat diclofenac for up to 6 months.
• Benefits met minimal clinically important difference thresholds in the usual-care and diclofenac comparisons - the improvements were large enough for patients to feel.
• Acupuncture added to exercise-based physical therapy showed no advantage for up to 11.25 months, suggesting the two therapies overlap rather than stack.
• Safety was good across all trials, positioning acupuncture as one of the few KOA options with months of post-treatment durability and minimal adverse-event burden.

Common questions